victor jaeggi



(No Model.)

U. V. JEGGI.

GALENDAR CLOCK. No. 339,657. Patented Apr. 13,v 1886.

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ir/NITED STATES PATENT OFFICE..

URS. VICTOR JAEGGI, OF AUBURN, SOUTH AUSTRALIA.

CALENDAR-CLOCK.

SFECIFICATION forming part of Letters Patent No. 339,657, dated April 13, 1886.

Application filed December 1T, 1885. Serial No. 185,917. (No model.)

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Be it known that I, Uns. VICTOR JAEGGI, a subject ofthe Queen of Great Britain, and a resident of Auburn, in the Province of South Australia, have invented certain Improvements in Calendar-Movements for Clocks, of which the following is a specilication.

My invention relates to that class or' ealen dar-movements for clocks wherein the calendar is actuated through the medium of the clock mechanism and shows the day of the month; and the object is to eii'ect the desired result with very simple mechanism that will be inexpensive and not liable to get out of order.

The mechanism I employ is not only simple and inexpensive, but it is so constructed that the calendar may be set forward at any time without disarraugement of any ofthe mechanism. rlhis mechanism comprises a dial divided into thirty-one spaces, and these spaces are numbered from one to thirty-one. To the back of the dial is secured a ratchet-wheel having thirty-one teeth. This dial and its ratchet-wheel is loosely mounted on the arbor of the hounwheel ol" the clock, and fixed on or formed with said arbor is a boss or cylinder,which has two obliquelyarranged circumferential grooves, the opposite Obliquity of which causes the said grooves to stand comparatively wide apart on one side ofthe boss, while on the opposite side they run together or intersect. A lever pivotally mounted on the clock-frame bears a pin which has a {iattened end that runs in the grooves in the boss, whereby two revolutions of the hour-hand over the clock-dial imparts a single reciprocating or to-and-fro motion to the lever bearing the piu. A pawl actuated by this lever is thus caused to move the ratchet-wheel on the calendar-dial one notch equivalent to one thirtyrst ol' a revolution whenever the hourhand has traversed the clock-dial twice or every twenty-four hours. A detentspring steadies the ratchet-wheel and prevents backward rotation. The figures on the calendardial may appear through an aperture in the clock-dial in a well-known way; or the calendar-dial may be replaced by ahand or index which willpoint to numerals on a fixed dial.

In the drawings, which serve to illustrate my invention, Figure l is front elevation ot' l A is a part of the clock-frame. B is a calendar-dial in the face of which are marked theV thirty-one numerals. In Fig. l I have only shown a part of these numerals, which will suffi ce to illustrate.

C is a ratchet-wheel secured to the dial B.

a is the arbor of the hour-wheel, on' which the ratchet-wheel and calendar-dial are rotatively mounted, and Il is the minute -hand arbor.

D is a boss or cylinder, usually of metal, which is ixed on or forms a part of the arbor a of the hour-wheel. 'This boss has formed in it two circumferential grooves, c c, which are obliquely arranged,so that they stand some distance apart on one side, but intersect on the opposite side, as clearly shown. For convenience of description I have referred to this device as two grooves, but it may also be considered a double loop or figure 8 groove.

E is a lever or arm pivotally mounted at d on the clock-frame or on some fixed part, and extending out over the boss D. In the free end of arm E is rotatively mounted a pin, e, the end of which rests in the groove c. rlhe end of this pin, which engages the groove, is somewhat elongated and elliptical in crosssection, as seen in the plan view, Fig. 4, in order that when the boss D revolves this pin may cross from one groove, c, to the other at the intersection, and recross at the next revolution.

. It will readily be seen that two revolutions ofthe boss D will, with the aid ofthe grooves and the pin, impart one complete vibratory movement to arm E. In order to transmit this movement to the ratchetwheel C, I employ a pawl, F, which is loosely .mounted or pivoted on a pin or stud, f, fixed in the clockframe, and is provided with asprng, g, to hold it elastic-ally up to a shoulder on the stud. rlhis construction is clearly shown in Fig. 5.

To couple the pawl F to the arm E, I employ an arm, F', which is fixed to the pawl at one end, and loosely engages the arm Eat the other. The free end of the pawl engages the teeth of ratchet-wheel C. As the pawl, where it engages the ratchet-wheel, must move obliquely, owing 'to the rotundity of the said wheel,"I mount it loosely on its studf, and provide it with a spring, as described.

II is the spring-detent, designed to steady the ratchet-wheel and hold it against backward rotation.

It will be understood without further eX- planation that the parts must be so 'proportioned that the vibration of arm E will only advance the ratchet-wheel one tooth, if thirtyone teeth are employed in it.

The operation is as-followsz As' the hourwheel revolves the boss D is carried around with arbor a. The pin e in arm E, compelled by the cam-grooves c c, for the first twelve hours moves outward or toward the dial, (for examplc,) and acting through arm Eand arm F', depresses the free end of the pawl far enough to cause said pawl to wipe over one tooth of ratchet-wheel C, and take position behind it. The movement of pin e for the next twelve hours will be in the opposite direction, or from the dial, and during this timethe free end of the pawl will be moved upward, and in its upward movement it will advance the ratchet wheel onev tooth. If desired, this twelve-hour movement of the ratchet-wheel may be effected during the night.

Having thus described my invention, I claim'- 1. In a calendar-movement for clocks, the combination, with a rotatively-mounted indicator for the days of the month, of the hourwheel arbor, the grooved boss D, mounted thereon,and means, substantially as described, for converting the continuous rotary motion of the said boss into intermittent rotary motion of the said day-indicator, as set forth.

2. rlhe combination, vwith a rotativelymounted indicator for the days of the month, the hour-wheel arbor, and the grooved boss D, mounted thereon,of the pivoted arm E, the pin e, rotatively mounted in said arm and engaging the groove in the boss D, and means,

substantially as described, for converting the vibratory movement of the arm E into intermitteilt rotary motion of the said day-indicator, as set forth.

3. The combination, with the hour wheel arbor and the grooved boss D mounted thereon, of the arm E, and its pin e, arranged to operate as shown, the pivoted pawl F, engaging ratchet-wheel C, and connected to arm E by an arm, F', the said ratchet-wheel C, its spring-detent, and a day-indicator secured to said ratchet-wheel, substantially as set forth.

4. .The combination, with the hour-wheel arbor and the boss D fixed thereon, and provided with the grooves c c, as shown, ofthe lettered calendar-dial B and its ratchet-wheel C, mounted loosely on the hour-wheel arbor, the detent to prevent the backward rotation of the ratchet-wheel, the pin e, engaging the grooves in the boss D, the pawl for driving the ratchet-wheel intermittently, and means, substantially as described, between the pin e and said pawl whereby the former actuates the latter, substantially as set forth.

In witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

. URS. VICTOR JAEGGI.

Vituesses:

FRANCIS HUGH SNOW, J oHN EDWIN J nFFREYs. 

